A device and method for measuring the pressure in a radioactive container under fire conditions

Abstract

This invention relates to a device and method for measuring the internal pressure of a radioactive container under fire conditions. The container includes an inner container and an outer container, with the inner container disposed within the outer container. The measuring device includes a pressure-conducting tube, a first pressure-measuring element, a second pressure-measuring element, and a controller. One end of the pressure-conducting tube extends into the inner container, and the other end extends out of the container and is connected to the first pressure-measuring element. At least the portion of the pressure-conducting tube located outside the container is provided with a heat-insulating structure. The first pressure-measuring element is used to measure the pressure inside the inner container. The second pressure-measuring element is used to measure the ambient pressure. The controller is connected to the first and second pressure-measuring elements to obtain the gauge pressure inside the inner container based on the measurements from the first and second pressure-measuring elements. This invention incorporates a heat-insulating structure on the pressure-conducting tube, making the measured value of the first pressure-measuring element closer to the pressure value inside the inner container, reducing measurement errors. The second pressure-measuring element, with correction using a standard pressure source, further enhances the accuracy of the pressure measurement.

Description

Technical Field

[0001] This invention relates to the field of pressure measurement equipment technology, and in particular to a device and method for measuring the internal pressure of a radioactive container under fire conditions. Background Technology

[0002] According to relevant national regulations, some radioactive material transport containers must undergo safety performance verification under fire conditions before being put into use. During fire condition tests, the thermal environment temperature of the transport containers can reach 800℃. This high temperature makes measuring the internal pressure of the transport containers difficult. Specifically, direct pressure measurement using pressure gauges is unsuitable because pressure gauges are generally not heat-resistant, and the data cables of pressure sensors are also not heat-resistant. Furthermore, the high temperature environment of a fire will cause the temperature inside the pressure tapping tube to rise, resulting in a temperature difference between the container's internal temperature and the temperature inside the pressure tapping tube, leading to a deviation between the pressure gauge reading and the actual pressure value inside the container. These problems urgently need to be addressed. Summary of the Invention

[0003] This invention discloses a device and method for measuring the internal pressure of a radioactive container under fire conditions, aiming to solve the technical problems existing in the prior art.

[0004] The present invention adopts the following technical solution:

[0005] In a first aspect, the present invention provides a device for measuring the internal pressure of a radioactive container under fire conditions. The container includes an inner container and an outer container, the inner container being disposed within the outer container. The measuring device includes a pressure-conducting tube, a first pressure-measuring element, a second pressure-measuring element, and a controller. One end of the pressure-conducting tube extends into the inner container of the container, and the other end extends out of the container and is connected to the first pressure-measuring element. At least the portion of the pressure-conducting tube located outside the container is provided with a heat-insulating structure. The first pressure-measuring element is used to measure the pressure inside the inner container. The second pressure-measuring element is used to measure the ambient pressure. The controller is connected to the first pressure-measuring element and the second pressure-measuring element to obtain the gauge pressure inside the inner container based on the measurements taken by the first pressure-measuring element and the second pressure-measuring element.

[0006] In the device for measuring the internal pressure of a radioactive container under fire conditions of the present invention, the heat insulation structure is an aerogel layer disposed on the surface of the pressure guiding pipe.

[0007] In the device for measuring the internal pressure of a radioactive container under fire conditions of the present invention, the pressure guiding tube is made of stainless steel, with a diameter of 3 mm and a thickness of 0.5 mm.

[0008] In the device for measuring the internal pressure of a radioactive container under fire conditions of the present invention, the first pressure measuring element has a range of 0 to 100 kPa; the second pressure measuring element has a range of 0 to 10 kPa.

[0009] In the device for measuring the internal pressure of a radioactive container under fire conditions according to the present invention, the pressure guiding tube is at least sealed to the inner container through a sealing connector; the sealing connector includes a seal and a connector; the seal is sleeved and sealed to the pressure guiding tube, and the seal abuts against the opening edge of the inner container; the connector includes a fixing member and a screw member; the fixing member is used to fix to the surface of the outer container and has a channel communicating with the inside of the outer container; the screw member is sleeved on the outside of the fixing member and screwed to the fixing member; the pressure guiding tube passes through the screw member so that when the screw member is screwed to the fixing member, the seal abuts against the opening edge of the inner container.

[0010] In the device for measuring the internal pressure of a radioactive container under fire conditions of the present invention, the sealing element is a frustum-shaped structure, coaxially arranged with the pressure guiding tube, and the side of the frustum-shaped structure abuts and seals against the opening edge of the inner container.

[0011] In the device for measuring the internal pressure of a radioactive container under fire conditions of the present invention, the sealing element, the pressure guiding tube, and the container are all made of metal, and the coefficient of thermal expansion of the sealing element is greater than that of the pressure guiding tube and the container.

[0012] In a second aspect, the present invention also provides a measurement method using the above-described measuring device, comprising the following steps:

[0013] For the initial sealing test, gas is introduced into the pressure-conducting tube until the measured pressure is reached, and then the gas supply is stopped. The controller records the measured value of the first pressure-sensing element and calculates the rate of decrease of the measured value.

[0014] If the rate of decrease of the measured value is greater than or equal to a first threshold, then check each connection until the rate of decrease of the measured value is less than the first threshold.

[0015] If the rate of decrease of the measured value is less than the first threshold, then proceed to the next step;

[0016] A second sealing test was conducted by connecting the pressure-conducting tube to the container and measuring the sealing performance of the measuring device again.

[0017] If the sealing meets the requirements, then transfer the container to a fire simulation environment and check whether the first and second pressure measuring elements show normal readings.

[0018] If everything is normal, proceed to the next step.

[0019] If the reading is abnormal, adjust the first and second pressure measuring elements until the reading is normal.

[0020] If the sealing does not meet the requirements, repeat this step;

[0021] The test begins by adjusting the fire simulation environment to a fire condition, and the controller stores and records the measured values ​​of the first and second pressure measuring elements.

[0022] In the measurement method of the present invention, prior to the preliminary sealing test, the following steps are also included:

[0023] Based on the model of the container, determine the model of the pressure-conducting tube and the range and accuracy of the first pressure-measuring element and the second pressure-measuring element;

[0024] Connect the pressure-conducting tube to the first pressure-sensing element;

[0025] Initial installation involves connecting the first and second pressure sensing elements to the controller, then turning on the controller to test whether the controller, the first pressure sensing element, and the second pressure sensing element are functioning correctly.

[0026] If yes, proceed to the next step.

[0027] If not, repeat this step.

[0028] The measurement method of the present invention also includes a device calibration step;

[0029] The device calibration steps include:

[0030] Connect one side of the pressure-conducting tube to a standard pressure source;

[0031] A correction factor is obtained based on the pressure value of the standard pressure source and the measured value of the first pressure measuring element;

[0032] The controller records the model number of the pressure-conducting tube in a one-to-one correspondence with the correction coefficient.

[0033] The technical solution adopted in this invention can achieve the following beneficial effects:

[0034] This invention primarily provides a device for measuring the internal pressure of a radioactive container under fire conditions. Based on connecting the inner container to a first pressure-measuring element via a pressure-conducting tube, the pressure is externally directed, keeping the first pressure-measuring element away from the fire environment, thus enabling its normal operation. Furthermore, by insulating the pressure-conducting tube with a heat-insulating structure, the influence of the high temperature of the fire environment on the gas temperature inside the tube is reduced, making the measured value of the first pressure-measuring element closer to the pressure value inside the inner container, reducing measurement errors. By incorporating a second pressure-measuring element, the difference between the measured values ​​of the first and second pressure-measuring elements is used as the gauge pressure inside the inner container, making pressure measurement more accurate. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 This is one of the structural schematic diagrams of a device for measuring the internal pressure of a radioactive container under fire conditions according to the present invention;

[0037] Figure 2 This is a second schematic diagram of the structure of a device for measuring the internal pressure of a radioactive container under fire conditions according to the present invention;

[0038] Figure 3 This is a schematic diagram of the connector of the present invention;

[0039] Figure 4 This is a schematic diagram of the pressure-conducting tube of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Pressure guiding tube; 11. Inner tube; 111. Easily fusible structure; 12. Outer tube; 2. First pressure measuring element; 3. Second pressure measuring element; 4. Controller; 5. Thermal insulation structure; 6. Sealing connection; 61. Sealing element; 62. Connecting element; 621. Fixing element; 6211. Channel; 622. Threaded connection; A. Container; A1. Inner container; A2. Outer container. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0044] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0045] To address the problems existing in the prior art, this application provides a measuring device and method for measuring the internal pressure of a radioactive container under fire conditions.

[0046] Example 1

[0047] This embodiment provides a device for measuring the internal pressure of a radioactive container under fire conditions. Container A includes an inner container A1 and an outer container A2, with the inner container A1 disposed inside the outer container A2. Figure 1 As shown, the measuring device includes a pressure guide tube 1, a first pressure measuring element 2, a second pressure measuring element 3, and a controller 4. One end of the pressure guide tube 1 can extend into the inner container A1 of container A, and the other end can extend out of container A and is connected to the first pressure measuring element 2, such as connecting to the pressure measuring port. Specifically, the length and diameter of the pressure guide tube 1 are selected as needed, such as selecting it based on the principle of minimizing the impact on the measured value of the first pressure measuring element 2. The portion of the pressure guide tube 1 located at least outside container A is provided with a heat insulation structure 5. The first pressure measuring element 2 is used to measure the pressure inside the inner container A1. The second pressure measuring element 3 is used to measure the ambient pressure. The controller 4 is connected to the first pressure measuring element 2 and the second pressure measuring element 3 and is used to obtain the measured values ​​of the first pressure measuring element 2 and the second pressure measuring element 3, so as to obtain the gauge pressure inside the inner container A1 based on the measured values ​​of the first pressure measuring element 2 and the second pressure measuring element 3, that is, the difference between the measured values ​​of the first pressure measuring element 2 and the second pressure measuring element 3.

[0048] The present invention discloses a device for measuring the internal pressure of a radioactive container under fire conditions. Based on connecting the inner container A1 to the first pressure measuring element 2 via a pressure guiding pipe 1, the pressure is externally directed, and the first pressure measuring element 2 is kept away from the fire environment, enabling it to operate normally. Furthermore, by setting a heat insulation structure 5 on the pressure guiding pipe 1, the influence of the high temperature of the fire environment on the gas temperature inside the pressure guiding pipe 1 is reduced, making the measured value of the first pressure measuring element 2 closer to the pressure value inside the inner container A1, thus reducing measurement errors. By setting a second pressure measuring element 3, the difference between the measured values ​​of the first pressure measuring element 2 and the second pressure measuring element 3 is used as the gauge pressure inside the inner container A1, making the pressure measurement more accurate.

[0049] In some preferred embodiments, the heat insulation structure 5 is an aerogel layer disposed on the surface of the pressure-conducting pipe 1; preferably, the thickness of the aerogel layer is 2 mm.

[0050] In some preferred embodiments, the pressure guide tube 1 is made of stainless steel, with a diameter of 3 mm (outer diameter) and a thickness of 0.5 mm; thereby reducing the influence of the pressure guide tube 1 on the measured value of the first pressure measuring element 2.

[0051] In some preferred embodiments, both the first pressure measuring element 2 and the second pressure measuring element 3 are pressure gauges.

[0052] In some preferred embodiments, the first pressure measuring element 2 has a range of 0 to 100 kPa (gauge pressure); the second pressure measuring element 3 has a range of 0 to 10 kPa (gauge pressure).

[0053] Preferably, the first pressure measuring element 2 has an accuracy of 1%; the second pressure measuring element 3 has an accuracy of 1%.

[0054] In some preferred embodiments, a charging / discharging port connected to the pressure-conducting tube 1 is also included for pressurizing the pressure-conducting tube 1 and the connection between the pressure-conducting tube 1 and the first pressure-measuring element 2.

[0055] In some preferred embodiments, the controller 4 provides power to the first pressure measuring element 2 and the second pressure measuring element 3, and records and stores the measured values ​​of the first pressure measuring element 2 and the second pressure measuring element 3. The controller 4 displays the real-time pressure and maximum pressure of the inner container A1 through a built-in processing program and provides a pressure curve. Specifically, the acquisition frequency of the controller 4 is greater than or equal to 1Hz, preferably 10Hz.

[0056] In some preferred embodiments, such as Figure 2 and 3As shown, the pressure-conducting tube 1 is at least sealed to the inner container A1 via a sealing connector 6; the sealing connector 6 includes a sealing element 61 and a connecting element 62; the sealing element 61 is sleeved and sealed to the outside of the pressure-conducting tube 1, and the sealing element 61 abuts against the edge of the opening of the inner container A1 for sealing, such as a metal seal or a high-temperature resistant sealing structure such as a polytetrafluoroethylene sealing gasket; the connecting element 62 includes a fixing element 621 and a screw element 622; the fixing element 621 is used to fix to the surface of the outer container A2 and has a channel 6 communicating with the inside of the outer container A2. 211; The screw connector 622 is sleeved on the outside of the fixing member 621 and screwed to the fixing member 621; The pressure guiding tube 1 is inserted through the screw connector 622 so that when the screw connector 622 is screwed to the fixing member 621, the sealing member 61 abuts and seals with the opening edge of the inner container A1; The sealing connector 6 realizes the detachable connection between the pressure guiding tube 1 and the container A, which is convenient for replacing pressure guiding tubes 1 of different specifications; Preferably, the screw connector 622 is screwed to the pressure guiding tube 1 to adjust the abutment force between the sealing member 61 and the opening edge of the inner container A1 to a greater extent.

[0057] In some preferred embodiments, such as Figure 2 As shown, the sealing element 61 has a frustum-shaped structure and is coaxially arranged with the pressure guide tube 1. The side of the frustum-shaped structure abuts and seals with the edge of the opening of the inner container A1. Since the sealing element 61 has a frustum-shaped structure, the side of the frustum-shaped structure can abut and seal with the mounting hole on the inner container A1, which can adapt to mounting holes of different specifications.

[0058] In some preferred embodiments, the sealing element 61, the pressure guiding tube 1, and the container A are all made of metal, and the coefficient of thermal expansion of the sealing element 61 is greater than that of the pressure guiding tube 1 and the container A. In this case, the sealing performance can be improved by applying a Teflon coating to the surface of the sealing element 61, as can be seen from existing high-temperature sealing structures. Based on this, in the event of a fire, the deformation of the sealing element 61 is greater than that of the pressure guiding tube 1 and the container A, and the seal between the sealing element 61 and the mounting hole is tighter, which can improve the sealing performance between the sealing element 61 and the inner container A1, that is, achieve self-sealing at high temperatures and improve high-temperature sealing performance. More preferably, the coefficients of thermal expansion of the sealing element 61, the pressure guiding tube 1, and the container A decrease in sequence. In the event of a fire, the pressure guiding tube 1 also expands, and the contact force of the sealing element 61 with the pressure guiding tube 1 increases, which in turn makes the seal between the sealing element 61 and the mounting hole tighter and improves high-temperature sealing performance.

[0059] In some preferred embodiments, such as Figure 4As shown, the pressure-conducting pipe 1 is a double-layered pipe with a vacuum space between the two layers. The double-layered pipe includes an inner pipe 11 and an outer pipe 12. The inner pipe 11 is connected to the first pressure measuring element 2 and is provided with a fusible structure 111. The melting temperature of the fusible structure 111 is lower than the fire temperature (such as a metal with a low melting point), so that when the temperature inside the inner pipe 11 is higher than the melting temperature of the fusible structure, it can melt. At this time, since the inner and outer pipes are connected, the influence of the gas expansion inside the inner pipe 11 due to the temperature rise on the measurement value of the first pressure measuring element 2 can be reduced. Specifically, the volume of gas that needs to be discharged into the vacuum space can be calculated based on the highest temperature value inside the inner pipe 11 during the fire, and then the volume of the vacuum space can be determined. The specific volume can be determined according to the working conditions.

[0060] Example 2

[0061] This embodiment provides a measurement method using the measuring device described in Embodiment 1 above, which includes the following steps:

[0062] For the initial sealing test, gas is filled into the pressure guide tube 1 to the measured pressure and then the gas supply is stopped. The controller 4 records the measured value of the first pressure measuring element 2 and calculates the rate of decrease of the measured value. The measured pressure is the maximum pressure value in the inner container A1 under fire conditions obtained through simulation calculation.

[0063] If the rate of decrease of the measured value is greater than or equal to the first threshold, then check each connection until the rate of decrease of the measured value is less than the first threshold.

[0064] If the rate of decrease of the measured value is less than the first threshold, then proceed to the next step;

[0065] For the second sealing test, connect the pressure guide tube 1 to container A and measure the sealing of the measuring device again. Specifically, the suction gun method or the pressure channel of the controller 4 can be used, that is, a pipeline connected to the pressure guide tube 1 is set up to test the airtightness of the measuring device.

[0066] If the sealing meets the requirements, then transfer container A to a fire simulation environment. At this time, the temperature of the fire simulation environment is room temperature. Check whether the first pressure measuring element 2 and the second pressure measuring element 3 are displaying normal readings.

[0067] If everything is normal, proceed to the next step.

[0068] If it is not normal, then adjust the first pressure measuring element 2 and the second pressure measuring element 3 until the display is normal;

[0069] If the sealing does not meet the requirements, repeat this step, reconnect the pressure guide tube 1 to container A, and check the sealing points or connections, etc.

[0070] The test begins by adjusting the fire simulation environment to a fire condition. The controller 4 stores and records the measured values ​​of the first pressure measuring element 2 and the second pressure measuring element 3. Specifically, the fire simulation environment can be a gas furnace or an oil tank.

[0071] The measurement method of the present invention can accurately measure the pressure inside the inner container A1 under fire conditions.

[0072] In some preferred embodiments, the following steps are also included:

[0073] Based on the model of container A, determine the model of pressure guide tube 1 and the range and accuracy of the first pressure measuring element 2 and the second pressure measuring element 3; specifically, select the diameter and length of pressure guide tube 1 with the principle of minimizing the impact on the measured value of the first pressure measuring element 2; preferably, the smaller the diameter and the shorter the length of pressure guide tube 1, the lower the impact on the measured value of the first pressure measuring element 2.

[0074] Specifically, the range of the first pressure measuring element 2 and the second pressure measuring element 3 is determined based on the simulation calculation results. For example, if the simulation calculation shows that the maximum pressure of container A during the heat resistance test is 500 kPa, then the range of the first pressure measuring element 2 should be 1000 kPa.

[0075] Connect the pressure guide tube 1 to the first pressure measuring element 2;

[0076] For initial installation, connect the first pressure measuring element 2 and the second pressure measuring element 3 to the controller 4, and turn on the controller 4 to test whether the controller 4, the first pressure measuring element 2, and the second pressure measuring element 3 are working properly.

[0077] If yes, proceed to the next step.

[0078] If not, repeat this step; that is, reconnect the first pressure measuring element 2 and the second pressure measuring element 3 to the controller 4, replace the seal if necessary, and replace the first pressure measuring element 2 and the second pressure measuring element 3 with the controller 4 of the same specifications if necessary.

[0079] In some preferred embodiments, a device calibration step is also included;

[0080] The device calibration steps include:

[0081] Connect the pressure-conducting pipe 1 to one side of container A and connect it to a standard pressure source;

[0082] A correction coefficient is obtained based on the pressure value of the standard pressure source and the measured value of the first pressure measuring element 2. Specifically, by setting different pressure values ​​of the standard pressure source, correction coefficients under different pressures are obtained. Specifically, the correction coefficient C = A / B, where A is the pressure value of the standard pressure source and B is the measured value of the first pressure measuring element 2.

[0083] The controller 4 records the model number of the pressure-conducting tube 1 and the correction coefficient in a one-to-one correspondence. Based on the fact that the controller 4 corresponds the model number of the pressure-conducting tube 1 with the correction coefficient and stores it in the controller 4, it is convenient to measure pressure-conducting tubes 1 of different specifications. That is, when measuring, you can simply select the model number of the corresponding pressure-conducting tube 1.

[0084] Preferably, the calibrated pressure range should be no less than 95% of the range of the first pressure measuring element 2.

[0085] In some preferred embodiments, the first threshold is 1 / 500 / 10min; if the pressure inside the inner container A1 reaches 500kPa, the difference between the measured values ​​of the first pressure measuring element 2 measured by the controller 4 and the measured values ​​at 10-minute intervals is not greater than 1kPa to be considered qualified; the specific value can be determined according to the usage requirements.

[0086] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A device for measuring the internal pressure of a radioactive container under fire conditions, the container comprising an inner container and an outer container, the inner container being disposed within the outer container, characterized in that, The measuring device includes a pressure guide tube, a first pressure measuring element, a second pressure measuring element, and a controller; One end of the pressure guiding tube can extend into the inner container of the container, and the other end can extend out of the container and is connected to the first pressure measuring element. At least the part of the pressure guiding tube located on the outside of the container is provided with a heat insulation structure. The first pressure sensing element is used to measure the pressure inside the inner container, and the first pressure sensing element is located away from the fire environment; The second pressure-sensing element is used to measure ambient pressure; The controller is connected to the first pressure measuring element and the second pressure measuring element to obtain the gauge pressure inside the inner container based on the measurements of the first pressure measuring element and the second pressure measuring element.

2. The device for measuring the internal pressure of a radioactive container under fire conditions according to claim 1, characterized in that, The heat insulation structure is an aerogel layer disposed on the surface of the pressure-conducting pipe.

3. The device for measuring the internal pressure of a radioactive container under fire conditions according to claim 1, characterized in that, The pressure guide tube is made of stainless steel, with a diameter of 3mm and a thickness of 0.5mm.

4. The device for measuring the internal pressure of a radioactive container under fire conditions according to claim 1, characterized in that, The first pressure measuring element has a range of 0~100kPa; the second pressure measuring element has a range of 0~10kPa.

5. The device for measuring the internal pressure of a radioactive container under fire conditions according to claim 1, characterized in that, The pressure-conducting tube is at least sealed to the inner container via a sealing connector; The sealing connection includes a seal and a connector; The sealing element is sleeved and sealed to the pressure guiding tube, and the sealing element abuts and seals against the opening edge of the inner container; The connector includes a fastener and a screw thread; The fastener is used to fix itself to the surface of the outer container and has a channel communicating with the interior of the outer container; The screw connector is sleeved on the outside of the fixing member and screwed to the fixing member; the pressure guide tube is inserted through the screw connector so that when the screw connector is screwed to the fixing member, the sealing member abuts against the opening edge of the inner container to seal.

6. The device for measuring the internal pressure of a radioactive container under fire conditions according to claim 5, characterized in that, The sealing element is a frustum-shaped structure, coaxially arranged with the pressure guiding tube, and the side of the frustum-shaped structure abuts against the edge of the opening of the inner container for sealing.

7. The device for measuring the internal pressure of a radioactive container under fire conditions according to claim 6, characterized in that, The sealing element, the pressure guiding tube, and the container are all made of metal, and the coefficient of thermal expansion of the sealing element is greater than that of the pressure guiding tube and the container.

8. A measurement method employing the measuring device described in any one of claims 1-7, characterized in that, Includes the following steps: For the initial sealing test, gas is introduced into the pressure-conducting tube until the measured pressure is reached, and then the gas supply is stopped. The controller records the measured value of the first pressure-sensing element and calculates the rate of decrease of the measured value. If the rate of decrease of the measured value is greater than or equal to a first threshold, then check each connection until the rate of decrease of the measured value is less than the first threshold. If the rate of decrease of the measured value is less than the first threshold, then proceed to the next step; A second sealing test was conducted by connecting the pressure-conducting tube to the container and measuring the sealing performance of the measuring device again. If the sealing meets the requirements, then transfer the container to a fire simulation environment and check whether the first and second pressure measuring elements show normal readings. If everything is normal, proceed to the next step. If the reading is abnormal, adjust the first and second pressure measuring elements until the reading is normal. If the sealing does not meet the requirements, repeat this step; The test begins by adjusting the fire simulation environment to a fire condition, and the controller stores and records the measured values ​​of the first and second pressure measuring elements.

9. The measurement method according to claim 8, characterized in that, Prior to the preliminary sealing test, the following steps are also included: Based on the model of the container, determine the model of the pressure-conducting tube and the range and accuracy of the first pressure-measuring element and the second pressure-measuring element; Connect the pressure-conducting tube to the first pressure-sensing element; Initial installation involves connecting the first and second pressure sensing elements to the controller, then turning on the controller to test whether the controller, the first pressure sensing element, and the second pressure sensing element are functioning correctly. If yes, proceed to the next step. If not, repeat this step.

10. The measurement method according to claim 8, characterized in that, It also includes device calibration steps; The device calibration steps include: Connect one side of the pressure-conducting tube to a standard pressure source; A correction factor is obtained based on the pressure value of the standard pressure source and the measured value of the first pressure measuring element; The controller records the model number of the pressure-conducting tube in a one-to-one correspondence with the correction coefficient.

Images